Definitely footers under the DAC. The cheap stock footers used by Schiit offer no isolation. Herbie's Tenderfeet will absorb and neutralize vibration. As stated above, placement of footers makes a difference.
Also, a damping weight on top helps when the unit utilizes a toroidal transformer, (I think the Yggy uses R-core transformers).
http://edensoundaudio.com/shop/category/damping-weights/
And totally agree to use an aftermarket power cord. And replace SMPS wall-warts. I've heard good things about IFI...
https://www.musicdirect.com/equipment/ifi-ipower-outboard-supply
Also, a damping weight on top helps when the unit utilizes a toroidal transformer, (I think the Yggy uses R-core transformers).
http://edensoundaudio.com/shop/category/damping-weights/
And totally agree to use an aftermarket power cord. And replace SMPS wall-warts. I've heard good things about IFI...
https://www.musicdirect.com/equipment/ifi-ipower-outboard-supply